GATE Physics: Questions 199 - 201 of 290

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Question number: 199

Question

A monochromatic plane wave at oblique incidence undergoes reflection at a dielectric interface. If k^i,k^r and n^ are the unit vectors in the directions of incident wave, reflected wave and the normal to the surface respectively, which one of the following expressions is correct?

Choices

Choice (4)

Response

a.

(k^i×n^)⋅k^r=0

b.

(k^i−k^r)⋅n^≠0

c.

(k^i×n^)⋅k^r≠0

d.

(k^i−k^r)×n^≠0

Passage

There are four energy levels E,2E,3Eand4E (where E>0). The canonical partition function of two particles is, if these particles are: